| 查看: 261 | 回复: 4 | |||
| 当前主题已经存档。 | |||
chemjl银虫 (小有名气)
|
[交流]
求助英译汉（化学类配合物纳米材料相关）
|
||
|
Multicarboxyl polymer-functionalized halloysite nanotubes (HNTs) were synthesized by controlled surface-initiated atom transfer radical polymerization (SI-ATRP) of methyl methacrylate (MMA) and/or hydroxyethyl methacrylate (HEMA) to form HNT-(PMMA-b-PHEMA) or HNT-PHEMA hybrids, followed by esterification of the hydroxyl groups on the PHEMA blocks using excessive succinic anhydride in pyridine. The obtained products, HNT-(PMMA-b-PSEMA) or HNT-PSEMA with multicarboxyl groups on the external layers, were coordinated with triplet europium ions (Eu3+) in the presence of 1,10-phenanthroline (phen). For comparison purposes, PSEMA and PMMA-b-PSEMA copolymer were also synthesized via the same procedure and used as macromolecular ligands for coordination with Eu3+. The microstructure and fluorescence properties of the four kinds of Eu3+ coordination complexes were characterized via FTIR, FESEM, EDS,1H NMR, TGA, and fluorescence spectroscopy. The conversion of hydroxyl groups to carboxyl groups during the esterification reactions was up to 100% for the synthesized polymers and modified HNT-based hybrids. The Eu3+ coordination HNT-based hybrids exhibited efficient narrow bandwidth emission of red light with high spectral purity when excited at 266 nm. The HNT-(PMMA-b-PSEMA)-Eu complex even gave 1.63 and 1.85 times higher emission intensities than those of HNT-PSEMA-Eu and (PMMA-b-PSEMA)-Eu complexes, respectively. The improved luminescence properties of both of the Eu3+ coordination HNT-based hybrids are attributable to the efficient intramolecular energy transfer from the hybrid ligands and phen to Eu3+ ions, and the rigid HNTs framework also plays a positive role in the enhancement of the emission intensity. Such photoluminescent Eu3+ coordination HNT-based hybrids are expected for spectroscopy probes, fluorescent plastics, and fluoroimmunoassay applications. 出处：J. Phys. Chem. C 2009, 113, 16238–16246 Synthesis and Characterization of Photoluminescent Eu(III) Coordination Halloysite Nanotube-Based Nanohybrids 由于我的方向与这个不相关，恳请哪位帮忙，金币不是问题，可以和我直接联络 |
回复此楼» 猜你喜欢
对氯苯硼酸纯化
已经有3人回复
-
求助:我三月中下旬出站，青基依托单位怎么办？
已经有12人回复
-
不自信的我
已经有12人回复
-
假如你的研究生提出不合理要求
已经有5人回复
-
所感
已经有4人回复
-
论文终于录用啦！满足毕业条件了
已经有28人回复
-
要不要辞职读博？
已经有7人回复
-
北核录用
已经有3人回复
-
实验室接单子
已经有3人回复
-
磺酰氟产物，毕不了业了！
已经有8人回复
slowstar
木虫 (职业作家)
- 翻译EPI: 13
- 应助: 12 (小学生)
- 金币: 16708.5
- 红花: 2
- 帖子: 3376
- 在线: 803小时
- 虫号: 712881
- 注册: 2009-03-02
- 性别: GG
- 专业: 热力学
2楼2010-01-23 17:41:20
chemjl
银虫 (小有名气)
- 应助: 0 (幼儿园)
- 金币: 326.4
- 帖子: 144
- 在线: 20.7小时
- 虫号: 168758
- 注册: 2006-01-16
- 性别: GG
- 专业: 微生物生理与生物化学
3楼2010-01-23 18:25:17
slowstar
木虫 (职业作家)
- 翻译EPI: 13
- 应助: 12 (小学生)
- 金币: 16708.5
- 红花: 2
- 帖子: 3376
- 在线: 803小时
- 虫号: 712881
- 注册: 2009-03-02
- 性别: GG
- 专业: 热力学
| 多羧基聚合物功能化埃洛石纳米管（HNTs）HNT-(PMMA-b-PHEMA) 或HNT-PHEMA杂合体可通过甲基丙烯酸甲酯（MMA）和/或甲基丙烯酸-2-羟乙酯（HEMA）的受控表面引发原子转移自由基聚合（SI-ATRP）合成得到，然后在吡啶(Py)里用过量的丁二酸酐将PHEMA（聚甲基丙烯酸-2-羟乙酯）嵌段聚合物上的羟基酯化。所得端基含多羧基基团的HNT-(PMMA-b-PSEMA) 或HNT-PSEMA产物再与三价铕离子（Eu3+）在1，10-菲咯啉（phen）存在下配位络合。为了对比，用上述相同的路线合成了PSEMA及PMMA-b-PSEMA的共聚物作为大分子配体与Eu3+了配位络合。用FTIR，FESEM, EDS, 1H NMR, TGA和荧光光谱测定了这四种Eu3+配位络合物的微观结构和荧光性质。对于所合成的聚合物和改性HNT基杂合体，在酯化反应这一步羟基100%转化为了羧基。Eu3+配位的HNT基杂合体在266nm受激发时展现了高效的红光窄带发射并且具有很高的光谱纯度。HNT-(PMMA-b-PSEMA)-Eu络合物甚至具有比HNT-PSEMA-Eu和（PMMA-b-PSEMA）-Eu络合物分别高1.63和1.85倍的发射强度。Eu3+络合物和HNT基杂合体的发光性质的提高可归因于杂化体配体及phen与Eu3+离子间的高效分子内能量转移，同时HNTs的刚性骨架也对发射强度的提高起到了促进作用。这样的光致发光Eu3+配位HNT基杂合体有望应用于光谱探针，荧光塑料以及荧光免疫测定。 |
4楼2010-01-23 22:03:15
slowstar
木虫 (职业作家)
- 翻译EPI: 13
- 应助: 12 (小学生)
- 金币: 16708.5
- 红花: 2
- 帖子: 3376
- 在线: 803小时
- 虫号: 712881
- 注册: 2009-03-02
- 性别: GG
- 专业: 热力学
5楼2010-01-23 22:06:02